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- 12. How much force would a car's tires need to provide to accelerate an 1800 kg car at a rate of 4.0 m/s?? Your answer: O 39 N O 450 N 1800 N O 7200 N6. A 60 kg man jumps 1.00 m down onto a concrete walkway. His downward motion stops in 0.0200 seconds. If he forgets to bend his knees, what force is transmitted to his leg bones? [Hint: Solve for the velocity of the man at instant his feet strike the ground using free-fall formulas. Solve for acceleration as he brought into rest. Then apply newton's second law.]5. If the brakes on a car exert a stopping force of -29,000 N and the car's velocity changes from 25 m/s to 0 m/s. It takes the car 2.45 seconds to come to a full stop. What is the mass of this car?
- A box is being pulled to the right over a rough surface. T> fk, so the box is speeding up. Suddenly the rope breaks. What happens? The box Select one: a. Slows steadily until it stops b. Continues with the speed it had when the rope broke С. Continues speeding up for a short while, then slows and stops. O d. Keeps its speed for a short while, then slows and stops. e. Stops immediatelymass. You place the mass on the ramp at an angle high enough that the mass starts sliding. You measure the time it takes to fall down a known distance, The time it takes to fall down the 45 degree ramp You have devised an experìment to measure the kinetic coefficient of friction between a ramp and a starting from a standstill is At = 0.55 sec, m-1 kg, and the distance it falls, Az, is 0.5 m. What is ? 7. Ax in At Ug19. The force required to bring an object weighing 65 lb from rest to a speed of 50 fps in 10 sec isapproximatelyA. 5 lb.B. 50 lb.C. 10 lb.D. 1 lb.
- A) 10 kg m B) I kg.m C) 100 kg.m 9 and 10) 2-kg weight which is attached to a 1.5 m length string, is released from rest when it is at position A. Determine a) its specd and b) the tension in the cord when the bob passes through its lowest position, B. 9) Speed A) 1.25 m/s B) 2.28 m/s C) 3.98 m/s D) 4.56 m/s E) 5.42 m/s 1.5 m 10) Tension A) 51.96 N B) 58.90 N B C) 66.26 N D) 89.89 N E) 95.12 N6. From a Kinetic Friction Experiment, calculate the coefficient of friction based on the following data, dexp acceleration (m/s?) M coefficient hanger mass (kg) Run block mass of friction (kg) 0.1322 Place answer below Run 1 0.1233 0.0700 (you must show the correct equation in symbolic form, and your work to receive full credit)35. A 2.0-kg purse is dropped from the top of the Leaning Tower of Pisa and falls 55 m before reaching the ground with a speed of 27 m/s. What was the average force of air resistance?
- 1. Two masses m, and m, are connected by a string which passes over a massless, frictionless pulley. Mass m, > m,. When released from rest the acceleration of the system is: т+ m, а. д m- m 1 m,- m. 1 2 b. g m,+ m, m. С. д m,- m m,m, d. g т,-т, т, е. д m,+ m, 120. A 1,300 kg car accelerates uniformly from rest to 60km/h over a distance of 40 m. How much force is being applied by the engine to do this ?.6. A 500 kg object is hanging from a spring attached to the ceiling. If the spring constant in the spring is 900 N/kg, how far does the spring stretch?